Ingredients
- 3 tablespoons unsalted butter, at room temperature
- 1 small yellow onion, thinly sliced
- 1 teaspoon fresh thyme leaves, chopped
- Kosher salt and freshly ground black pepper
- 1 tablespoon plus 1 teaspoon Dijon mustard
- 1/4 cup shredded sharp Cheddar
- 1/4 cup shredded Gruyere cheese
- 1/4 cup diced Robiola cheese
- 1 tablespoon prosecco
- 2 teaspoons fresh parsley, chopped
- 1 clove garlic, minced
- Four 1-inch-thick slices brioche
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